MSD 7530T Programmable Digital-7 Ignition Control Installation - Manual (Page 7)

INSTALLATION INSTRUCTIONS 7
M S D
• W W W . M S D P E R F O R M A N C E . C O M • ( 9 1 5 ) 8 5 7 - 5 2 0 0 • F A X ( 9 1 5 ) 8 5 7 - 3 3 4 4
STEP RETARDS
There are three step retards that are controlled through three corresponding activation wires or through
rpm. A minimum rpm can also be programmed that must be reached before a step becomes active.
A time based ramp can now be programmed to gradually bring the retard to its full On amount, or to
ramp the retard amount out (back to no retard) from its setting.
Step 1 - Pink Step 2 - Dark Brown Step 3 - Tan
Activation through Wiring: Each step is activated when 12 volts are applied to its corresponding
wire. When the steps are enabled at the same time the retard amounts are added together. The
maximum retard allowed by the Ignition is a total of 30° (including other retard amounts from a
launch, ICM or gear retard).
Activation through RPM: Each step retard can also be activated through rpm. In order to achieve
this, 12 volts must still be applied to the corresponding step retard, and an rpm value must be
selected from the Step RPM menu. When 12 volts are applied, the retard will not activate until
the rpm value is reached. Note that the retard will remain active above this rpm, even when other
stages are activated. It will deactivate when the rpm drops below the set amount.
Note: If you prefer to activate the step retards through the
activation wires and not rpm, then the rpm value in each
of the desired step menus must be set to 800 rpm.
Step Retard Off Delay: This feature will set a time based
delay to deactivate the step retards. This is designed to
keep the timing retarded to clear the engine of any nitrous
oxide prior to deactivating the retard. It is adjustable from
0 – 2.5 seconds and the default is 0.5 second.
Step Retard Ramp: Each retard step can be ramped to
and from its full retard amount over a time based program
(Figure 3). It is adjustable from 0-2.5 seconds in 0.01
second increments. Default is 0°.
RPM: The minimum engine rpm that must be
reached before a step retard is activated.
On: The amount of time it takes for the step retard
to reach its Retard Degree once activated. Allows a
gradual ramp On time to reach the Retard Degree.
User adjustable from 0.00 to 2.50 sec. (0.01 sec
increments).
Off: The amount of time it takes for the step to retard to
reach NO retard once deactivated. Allows a gradual
ramp Off time to reach NO Retard. User adjustable
from 0.00 to 2.50 sec. (0.01 sec increments).
Deg: The amount of retard.
Figure 3 Ramping the Step Retards.